| package archive |
| |
| import ( |
| "io/ioutil" |
| "os" |
| "path/filepath" |
| "syscall" |
| "testing" |
| |
| "github.com/docker/docker/pkg/system" |
| "github.com/stretchr/testify/require" |
| "golang.org/x/sys/unix" |
| ) |
| |
| // setupOverlayTestDir creates files in a directory with overlay whiteouts |
| // Tree layout |
| // . |
| // ├── d1 # opaque, 0700 |
| // │ └── f1 # empty file, 0600 |
| // ├── d2 # opaque, 0750 |
| // │ └── f1 # empty file, 0660 |
| // └── d3 # 0700 |
| // └── f1 # whiteout, 0644 |
| func setupOverlayTestDir(t *testing.T, src string) { |
| // Create opaque directory containing single file and permission 0700 |
| err := os.Mkdir(filepath.Join(src, "d1"), 0700) |
| require.NoError(t, err) |
| |
| err = system.Lsetxattr(filepath.Join(src, "d1"), "trusted.overlay.opaque", []byte("y"), 0) |
| require.NoError(t, err) |
| |
| err = ioutil.WriteFile(filepath.Join(src, "d1", "f1"), []byte{}, 0600) |
| require.NoError(t, err) |
| |
| // Create another opaque directory containing single file but with permission 0750 |
| err = os.Mkdir(filepath.Join(src, "d2"), 0750) |
| require.NoError(t, err) |
| |
| err = system.Lsetxattr(filepath.Join(src, "d2"), "trusted.overlay.opaque", []byte("y"), 0) |
| require.NoError(t, err) |
| |
| err = ioutil.WriteFile(filepath.Join(src, "d2", "f1"), []byte{}, 0660) |
| require.NoError(t, err) |
| |
| // Create regular directory with deleted file |
| err = os.Mkdir(filepath.Join(src, "d3"), 0700) |
| require.NoError(t, err) |
| |
| err = system.Mknod(filepath.Join(src, "d3", "f1"), unix.S_IFCHR, 0) |
| require.NoError(t, err) |
| } |
| |
| func checkOpaqueness(t *testing.T, path string, opaque string) { |
| xattrOpaque, err := system.Lgetxattr(path, "trusted.overlay.opaque") |
| require.NoError(t, err) |
| |
| if string(xattrOpaque) != opaque { |
| t.Fatalf("Unexpected opaque value: %q, expected %q", string(xattrOpaque), opaque) |
| } |
| |
| } |
| |
| func checkOverlayWhiteout(t *testing.T, path string) { |
| stat, err := os.Stat(path) |
| require.NoError(t, err) |
| |
| statT, ok := stat.Sys().(*syscall.Stat_t) |
| if !ok { |
| t.Fatalf("Unexpected type: %t, expected *syscall.Stat_t", stat.Sys()) |
| } |
| if statT.Rdev != 0 { |
| t.Fatalf("Non-zero device number for whiteout") |
| } |
| } |
| |
| func checkFileMode(t *testing.T, path string, perm os.FileMode) { |
| stat, err := os.Stat(path) |
| require.NoError(t, err) |
| |
| if stat.Mode() != perm { |
| t.Fatalf("Unexpected file mode for %s: %o, expected %o", path, stat.Mode(), perm) |
| } |
| } |
| |
| func TestOverlayTarUntar(t *testing.T) { |
| oldmask, err := system.Umask(0) |
| require.NoError(t, err) |
| defer system.Umask(oldmask) |
| |
| src, err := ioutil.TempDir("", "docker-test-overlay-tar-src") |
| require.NoError(t, err) |
| defer os.RemoveAll(src) |
| |
| setupOverlayTestDir(t, src) |
| |
| dst, err := ioutil.TempDir("", "docker-test-overlay-tar-dst") |
| require.NoError(t, err) |
| defer os.RemoveAll(dst) |
| |
| options := &TarOptions{ |
| Compression: Uncompressed, |
| WhiteoutFormat: OverlayWhiteoutFormat, |
| } |
| archive, err := TarWithOptions(src, options) |
| require.NoError(t, err) |
| defer archive.Close() |
| |
| err = Untar(archive, dst, options) |
| require.NoError(t, err) |
| |
| checkFileMode(t, filepath.Join(dst, "d1"), 0700|os.ModeDir) |
| checkFileMode(t, filepath.Join(dst, "d2"), 0750|os.ModeDir) |
| checkFileMode(t, filepath.Join(dst, "d3"), 0700|os.ModeDir) |
| checkFileMode(t, filepath.Join(dst, "d1", "f1"), 0600) |
| checkFileMode(t, filepath.Join(dst, "d2", "f1"), 0660) |
| checkFileMode(t, filepath.Join(dst, "d3", "f1"), os.ModeCharDevice|os.ModeDevice) |
| |
| checkOpaqueness(t, filepath.Join(dst, "d1"), "y") |
| checkOpaqueness(t, filepath.Join(dst, "d2"), "y") |
| checkOpaqueness(t, filepath.Join(dst, "d3"), "") |
| checkOverlayWhiteout(t, filepath.Join(dst, "d3", "f1")) |
| } |
| |
| func TestOverlayTarAUFSUntar(t *testing.T) { |
| oldmask, err := system.Umask(0) |
| require.NoError(t, err) |
| defer system.Umask(oldmask) |
| |
| src, err := ioutil.TempDir("", "docker-test-overlay-tar-src") |
| require.NoError(t, err) |
| defer os.RemoveAll(src) |
| |
| setupOverlayTestDir(t, src) |
| |
| dst, err := ioutil.TempDir("", "docker-test-overlay-tar-dst") |
| require.NoError(t, err) |
| defer os.RemoveAll(dst) |
| |
| archive, err := TarWithOptions(src, &TarOptions{ |
| Compression: Uncompressed, |
| WhiteoutFormat: OverlayWhiteoutFormat, |
| }) |
| require.NoError(t, err) |
| defer archive.Close() |
| |
| err = Untar(archive, dst, &TarOptions{ |
| Compression: Uncompressed, |
| WhiteoutFormat: AUFSWhiteoutFormat, |
| }) |
| require.NoError(t, err) |
| |
| checkFileMode(t, filepath.Join(dst, "d1"), 0700|os.ModeDir) |
| checkFileMode(t, filepath.Join(dst, "d1", WhiteoutOpaqueDir), 0700) |
| checkFileMode(t, filepath.Join(dst, "d2"), 0750|os.ModeDir) |
| checkFileMode(t, filepath.Join(dst, "d2", WhiteoutOpaqueDir), 0750) |
| checkFileMode(t, filepath.Join(dst, "d3"), 0700|os.ModeDir) |
| checkFileMode(t, filepath.Join(dst, "d1", "f1"), 0600) |
| checkFileMode(t, filepath.Join(dst, "d2", "f1"), 0660) |
| checkFileMode(t, filepath.Join(dst, "d3", WhiteoutPrefix+"f1"), 0600) |
| } |